SR 520 - Floating Bridge and Landings Project - Sentinel lights

What are the sentinels?

The new SR 520 floating bridge has four large towers, called “sentinels,” that mark the east and west ends of the world’s longest floating bridge. The tallest one, at the bridge’s east end, rises 123 feet above the lake’s surface. These towers not only add an architectural flair to the bridge, but also serve a critical function, allowing crews access to the bridge’s pontoon platform for maintenance.

Sentinel lighting

We illuminate the sentinels from dusk to dawn with LED lights. Teal is the standard color. Many color combinations are possible, however, which allows us to change the display color to commemorate holidays or support public events or causes of community significance.

How can I request a color change?

If you are interested in changing the sentinel lights for a public event or cause, please fill out our Sentinel Lighting Change Request Form (pdf 375 kb) and submit it to SR520Bridge@wsdot.wa.gov. Sentinel light changes are intended to recognize holidays and national and local campaigns, organizations and events of public significance. We cannot accommodate requests related to private events or political or religious events or campaigns. Details about the lighting policy and request process are listed in the request form (pdf 375 kb).

What lighting changes are coming up?

A calendar of August 2020 titled Sentinels schedule. The days of August 3 through 10 are shaded in orange and labeled Obliteride - Fred Hutchinson Cancer Research center.

Dates: Monday, Aug. 3, through Monday, Aug. 10
Color: Orange
Cause: Obliteride - Fred Hutchinson Cancer Research Center
Description: For the third year in a row, the SR 520 Program is partnering with Fred Hutch to support their "Glow Orange" campaign by turning the SR 520 floating bridge sentinel lights orange. This year, the Glow Orange campaign is highlighting COVID-19 and cancer research funded through the annual Obliteride.